# deduplicate an impression file to get only the last impression of the day
# per user
<a href="gzdog.html">gzdog</a> Impression_123456_10-31-2005.log.gz |
	(read header; echo $header; \
	 sort -k 2,2 -k 1r,1r -t `<a href="tochar.html">tochar</a> 0xfe`) |
	<b>funiq</b> -d `<a href="tochar.html">tochar</a> 0xfe` -f 2 > 2005-10-31.log

